1.It seems impossible for you to win a medal.

为您解答
第一句，不可以
第一句的谓语是seems，就表示不可以再出现同一个层次上面的任何一个谓语动词了。你自己都说了you win a medal是主谓宾，所以是错的，这里需要的是一个非谓语动词，所以加to变成不定式形式这种非谓语动词，fir you to win a medal属于不定式的符合结构，在这句里做真正的主语，it是形式主语。

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